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Scalextrix
@scalextrix
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Estimable Member
Joined: Sep 26, 2024
Last seen: Aug 11, 2025
Profile Activity
Topics: 6 / Replies: 47
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RE: Vaillant AroTherm Plus 7kW

@judith we had a thermostat fitted for the kitchen as there is a lot of solar gain, and it seems to have stopped that function. I'm not really b...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: "Condensing" heat pumps?

There are heat recovery heat pumps that are designed to work on exhaust gasses from other processes, in an industrial setting for example. They could...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant AroTherm Plus 7kW

@jamespa I have a hydronic baseboard heater in the kitchen but I don't think it will work as it only activates the fan above 35C water temp. Not wor...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant AroTherm Plus 7kW

What do you connect that to internally, I'm assuming standard radiators don't work?

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant AroTherm Plus 7kW

Thanks both, I found the 3kW on a UK document somewhere though I don't have it to add here right now. We are at that point where the 5kW unit is...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant AroTherm Plus 7kW

Thanks for the comprehensive write-up, I am considering the same unit. Do you know what the turn-down or minimum modulation is on the unit and roug...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Plate heat exchanger considerations

As far as I can tell my vented system would have a peak pressure of about 0.5 Bar, which technically does meet the absolute minimum pressure of the AS...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Plate heat exchanger considerations

Thanks, this is what I was thinking about, so as long as heat energy can transfer back through the PHE into the primary circuit during defrost, then t...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Plate heat exchanger considerations

@jamespa I don't understand any point in an air test, if that fails, then the pipes are then broken, and the system cannot be refilled without digging...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: All your heat pump problems solved by -- a plate heat exchanger in a plinth!

@jamespa I hope I'm wrong but I suspect you will get an error code if it gets too low. Vented systems are so much simpler, it would be nice if heat ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: All your heat pump problems solved by -- a plate heat exchanger in a plinth!

Yup, I see no reason to artificially pressurize low temperature heating technology, but as far as I can see that's the method most Heat Pumps follow. ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: All your heat pump problems solved by -- a plate heat exchanger in a plinth!

@jamespa nothing to do with the needed pressure. Current pipework is likely 60 years old, buried in concrete and as such in an unknown condition. C...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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